GPS Plate Motions

We have a file from SOPAC, which is at Scripps Institution of Oceanography (SIO), University of California, San Diego (UCSD) . They study high precision geodetic and geophysical meaurements from GNSS for earthquake hazards, tectonic plate motion, plate boundary deformation and, meteorology.  They are co-located with the California Spatial Reference Center (CSRC), in partnership with surveyors, engineers, GIS professionals, the National Geodetic Survey (NGS), and the California Department of Transportation (Caltrans), to establish and maintain an accurate state-of-the-art network of GPS control stations  to meet the government and private business requirements for a reliable spatial reference system in California.

The input data was a text file, which was converted to a point GIS data base. 

 

Text file from http://sopac.ucsd.edu/velocities.shtml .

Import into a GIS requires removal of the first line, and checking that the field names meet the requirements for dBase and shapefiles (they do).  You can do the modification in Notepad or Excel.  Excel's import wizard will let you skip the metadata line at the beginning of the file; you want to keep the line with field names.  Export from Excel in CSV format.

It did not have coordinates.

ASCII file from SOPAC with the site names and locations.  After conversion to a dBase table, it can be Joined to the velocities, and the lat/long coordinates can be imported.

 

Global topography to load ETOPO1.  This allows you to see the motions in relation to topography.

Database, and open


Last revision 1/8/2018